Lexus SC300 / Lexus SC400. Manual — part 892
Check for open in harness and connector between terminals E01, E02 of engine
(& ECT) ECU connector and body ground (See page
Disconnect injector connector (See page
Resistance: 13.4 – 14.2
Ω
at 20
°
C (68
°F)
•
Injection volume
70 – 88 cc/15 sec. (4.3 – 5.4 cu in.)
Difference between each injector:
Less than 9 cc (0.5 cu in.)
•
L
e
a
k
a
g
e
Fuel drop: One drop or less per minute.
Measure resistance of injector.
Check injection volume of injector
(See page
Replace injector.
Check and replace engine (& ECT) ECU.
Repair or replace harness or connector.
Check injectors.
–
ENGINE TROUBLESHOOTING
Circuit Inspection
TR–131
Back Up Power Source Circuit
CIRCUIT DESCRIPTION
Battery voltage is supplied to terminal BATT of the ECU even when the ignition switch is off for use by
the diagnostic code memory and air–fuel ratio adaptive control value memory, etc.
DIAGNOSTIC CHART
DIAGNOSTIC CHART
Check for short in all the harness and
components connected to EFI fuse.
Check EFI fuse.
Check of terminal BATT.
Proceed to next circuit inspection shown on
matrix chart (See page
Check operation for the back up.
Check and replace ECU.
Check and repair harness or connector
between battery, EFI fuse and ECU.
WIRING DIAGRAM
TR–130
–
ENGINE TROUBLESHOOTING
Circuit Inspection
OK
NG
OK
NG
YES
NO
INSPECTION PROCEDURE
1
Check EFI fuse.
C
OK
P
Remove EFI fuse from R/B No.2.
Check continuity of EFI fuse.
Continuity
Check for short in all the harness and components con-
nected to EFI fuse (See attached wiring diagram).
2
Check voltage between terminal BATT of engine & ECT ECU connector and body ground.
C
OK
P
Connect the Check Harness A.
(See page
Measure voltage between terminal BATT of engine &
ECT ECU connector and body ground.
Voltage:
10 – 14 V
Check and repair harness or connector between engine
& ECT ECU and EFI fuse, EFI fuse and battery.
3
Are the diagnostic codes still in the memory when the ignition switch is turned OFF?
Check and replace engine & ECT ECU.
Proceed to next circuit inspection shown on ma-
trix chart (See page
).
–
ENGINE TROUBLESHOOTING
Circuit Inspection
TR–131
Injector Circuit
CIRCUIT DESCRIPTION
The injectors are provided to the intake manifold. They inject fuel into the cylinders based on the signals from
the engine & ECT ECU.
DIAGNOSTIC CHART
DIAGNOSTIC CHART
Replace ignition relay.
Check voltage between terminals #10 ~ 40 of
engine & ECT ECU and body ground.
Check ignition relay.
Check continuity between terminal E01, E02
and body ground.
Repair or replace harness or
connector.
Repair or replace harness or
connector.
Replace injector.
Check for open in harness and connector
between ignition relay and ECU.
Check operation for injectors.
Proceed to next circuit inspection shown on
matrix chart (See page
Check and repair harness and connector
between ignition relay and battery.
TR–132
–
ENGINE TROUBLESHOOTING
Circuit Inspection
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